Hi!
My brand new SGS2 quickly got bad blocks on the ... /efs partition.
Talk about bad luck, radio wouldn't work. Also, odin, etc wouldn't format that properly as EFS shouldn't be deleted (even "Phone EFS clear" does not work)
After tinkering around a while, granted that you DO HAVE a backup of the /efs (when you buy the phone and root it, for the love of whatever you believe in ALWAYS BACKUP EFS), I found a way to do it properly.
If you do not have a backup (ARE U NUTS?!) try this in adb shell as root:
# cp -r /efs /sdcard/efs
If there's no error, it might work. Even if there's errors, but /sdcard/efs is not empty, it might work. If you have ._nvdata kind of files that copied successfully, you might also be able to recover something. (post here for assistance if so, i guess)
Note that regular write/reads and regular dd'ing won't work.
Anyhow.
1: root the phone
2: coy your efs backup to your sdcard (eg as /sdcard/efs in my example)
3: adb shell to the phone, su if necessary (=be root)
4: # umount /efs
5: # dd if=/dev/block/mmcblk0p1 of=/dev/null bs=1
*wait a while*
Check the number of bytes it has read and copy it, normally it should be 20971520 (20 megs)
<size> is without the "<>" eg make_ext4fs -l 293938 -a ...
6: # make_ext4fs -l <size> -a efs /sdcard/efs_new.img /sdcard/efs
7: # dd if=/sdcard/efs_new.img of=/dev/block/mmcblk0p1 bs=1
*wait ages*
8: # mount -text4 /dev/block/mmcblk0p1 /efs
*check theres no error*
9: # reboot
10: # verify you have no I/O error in dmesg
Good luck!
And remember:
This voids your warranty.
This is at your own risk.
Making mistakes/typoes in the devices names can BRICK your device.
I am not responsible if anything wrong happen.
Thanks for the howto.
Have you any idea how you got those bad blocks in the first pkace ?
nope
i wasnt doing anything special, hard the phone only recently
at one reboot it didnt want to take my sim card pin anymore, then later radio wouldnt turn on at all (cause it couldn't read /efs)
That's pretty scary...:s
Send from my Galaxy S II running on VillainRom.
This happened to my samsung nexus s do you think there is a similar recovery for my device? i hhave some bad blocks
Any news for a nexus s bilboa I've got bad blocks :s and sometimes radio wont start and crash I have atm 8 badblocks, if it is not fixable can I make a workaround like on cm7 that original efs partition is untouched (in cm7 for i9000)
Thanks
Sent from my Nexus S using XDA App
You saved my life! My IMEI was completely lost and so I could recover it. Thank you very much for the guide.
I keep getting umount: not found when i try to unmount /efs. Whats wrong?
...and on the 8th day he created the SGS II!
What do i do if the EFS folder is completely empty??
you're screwed then sorry
Is your problem solved.. I am also facing same problem.
I lost my IMEI number.
Please help me out
Related
Hi xda,
i bought myself a I9100 with the following Specs:
Android-Version: 2.3.5
PDA: I9100BHKJ1
Phone: I9100XXKI4
CSC: I9100 XEGKJ1
Baseband: I9100XXKI4
Kernel-Version: 2.6.35.7-I9100BHKJ1-CL630390 [email protected] #2
Buildnumber: GINGERBREAD.BHKJ1
PCode: GT-I9100LKAXEG
It has a branding from the German Provider 1&1
I am interested in doing a Backup (nandroid, EFS, Kernel) of my Phone whenever i experience Problems with the Software. Additionally i am (of course) interested in trying new roms or get the soon to come ICS early.
My Problem is, that i cant do that because i have no Download-Source for that Rom to get my Phone back to stock.
So i think the only way would be to Backup the existing Software on the Phone. What would be the right way to do it? I cant flash a rooted Kernel because i will lose my original one. I cant put CWM/Titanium on the Phone without root. And how would i deinstall CWM?
Is there maybe a possibility to use the Guarantee from Samsung directly, when i use another stock Rom?
Help would be highly appreciated.
btw: Merry Christmas and thanks for any Answers
There's a few ways of achieving what you want, but none are guaranteed to keep your warranty, as it's obviously done at your own risk.
You could achieve temp root by using the zergRush exploit. From there you could dump the current kernel, then either flash a kernel which comes with CWM recovery and do a nandroid backup, or dump the whole filesystem without changing kernel at all.
If you're comfortable with adb, see http://forum.xda-developers.com/showthread.php?p=15670403#post15670403 (ignore the part about flashing an insecure kernel, as zergRush should make that part unnecessary).
Thank you for the advice. I think that is what i need to do.
I have to add one more thing (no im not the Ghost of Steve Jobs ). I dont have experience on adb-Shell or Linux in General.
But i would like to try that with your help.
If i did understand it right the way could be:
get root on my stock Kernel with Zergrush
[
How do i get into the Shell?]
Dump all images [Are the command in the mentioned Thread correct? My SGS2 has no SD-Card inside, will that be a problem?]
Alternatively Dump the Kernel only
Install rooted CWM'ed Kernel [How?]
Use Nandroid/Titanium/EFS-Backup
How will i bring all the Images back to the Phone when needed? Respectively the Kernel Only if i used CWM for Backup?
Maybe there exists a detailed howto, because i dont have the maybe needed experience?
I think getting Root with Doomlord/Zergrush is no problem.
When i got root, where exactly i paste the commands shown here (http://forum.xda-developers.com/showthread.php?p=15670403#post15670403)
When i dump the Kernel it will be a rooted dump and i will have to unroot it after putting it back?
How exactly will i have to do the "putting it back" when i need to?
I did not find a Guide (for Noobs like me) or maybe a Tool like HC-kTool (but its for EFS only), that could make things easy. If someone could explain some of these things to me i am willing to learn
How to backup your Phone without Flashing anything by using the Zergrush Exploit
(Now with temp-root method, look at the Bottom)
high chance backups might not work, because the sources are mounted in this guide, doing this i a unmounted state (recovery console from cwm) should work
You need:
Android SDK (to get adb.exe)
Zergrush Doomlord V3 ROOT (Android 2.2 and 2.3)
Zergrush Doomlord V1 UNROOT
Installed Drivers for your Phone
Have all Programs deactivated that use your Device (like Kies)
Your brain, because you do this at your own Risk.
BACKUP your Phone (tested on I9100)
1
Root your Device with Doomlord V3 ROOT following all his hints
http://forum.xda-developers.com/showthread.php?t=1312859
2
Start your command prompt (cmd) and use cd.., dir and cd [Folder] to move to your Folder with adb.exe
type
adb shell [Enter]
su [Enter]
3
Dump the Partitions following all hints from HellcatDroid:
http://forum.xda-developers.com/showthread.php?p=15670403#post15670403
Code:
dd if=/dev/block/mmcblk0p1 of=/sdcard/p1-EFS.img bs=4096
dd if=/dev/block/mmcblk0p4 of=/sdcard/p4-PARAM.img bs=4096
dd if=/dev/block/mmcblk0p5 of=/sdcard/p5-KERNEL.img bs=4096
dd if=/dev/block/mmcblk0p8 of=/sdcard/p8-MODEM.img bs=4096
dd if=/dev/block/mmcblk0p9 of=/sdcard/p9-FACTORYFS.img bs=4096
dd if=/dev/block/mmcblk0p12 of=/sdcard/p12-HIDDEN.img bs=4096
You can exit the su and the adb shell with "exit".
Hint: p9 and p12 are big, the Copying did run 70 Seconds for me
4
Unroot your Device again with Doomlord V1 UNROOT following all his Hints
http://forum.xda-developers.com/showthread.php?t=1321582
When everything is done you can deactivate the USB debugging-Mode and copy the Backups from your internal SD-Card to any safe Positions.
Put back your Backups [untested]
1
Have a rooted Kernel / Flash a rooted Kernel / Root with Doomlord V3 ROOT
put the Images back directly onto the Phone
2
Start your command prompt and use cd.., dir and cd [Folder] to move to your Folder with adb.exe
type
adb shell [Enter]
su [Enter]
3
(Information taken from HellcatDroids posts
http://forum.xda-developers.com/showpost.php?p=16052607&postcount=61 and
http://forum.xda-developers.com/showthread.php?p=15670403#post15670403 )
Code:
dd if=/sdcard/p1-EFS.img of=/dev/block/mmcblk0p1 bs=4096
dd if=/sdcard/p4-PARAM.img of=/dev/block/mmcblk0p4 bs=4096
dd if=/sdcard/p5-KERNEL.img of=/dev/block/mmcblk0p5 bs=4096
dd if=/sdcard/p8-MODEM.img of=/dev/block/mmcblk0p8 bs=4096
dd if=/sdcard/p9-FACTORYFS.img of=/dev/block/mmcblk0p9 bs=4096
dd if=/sdcard/p12-HIDDEN.img of=/dev/block/mmcblk0p12 bs=4096
4
Unroot your Device again with Doomlord V1 Unroot following all Hints there
http://forum.xda-developers.com/showthread.php?t=1321582
Credits to: HellcatDroid, Revolutionary for the Zerglings, oinkylicious, DooMLoRD, paxChristos, MistahBungle (for the extra Motivation )
I think it would help everyone if you could make a full backup of your very own device instead of having to download a Rom and Kernel that hopefully fits your device. With this method we leave minimal traces
Without Doomlord (no su etc needed)
I tested the Tip from oinkylicious. It worked!
You dont need Doomlord ROOT and UNROOT for this Procedure (but its the best for permanently rooting your Kernel)
At the Points in my Guide where i use Doomlord, you can use the Zergrush-Method directly. And you dont need the unrooting-step (tested with titanium backup). In addition you dont need the su-command from step 2.
Follow the points here (thanks to paxChristos):
1) Put a fresh (just formatted with no data on it) SD Card into your phone (this helps with some roots, not all, but better safe than sorry)
2) On your phone, goto settings -> applications -> development and check "USB debugging"
3) Plug your phone into your computer
4) Download zergRush
5) unzip zergRush
6) navigate to android sdk (varies from computer to computer, my (win7) install location was c:\Android-SDK-x86 (or something like that)
7) (If you've already downloaded all the sdk tools, you don't need this one) Download and install any missing sdk tools (i.e. adb) (i just selected most of the and let my computer sit overnight to install everything)
8) run command prompt (in windows 7, press windows flag + r to open up the run command, then type cmd, hit enter)
9) Navigate to the "platform-tools" folder inside of your android-sdk folder
10) type in "adb push C:\[location of zergRush]\zergRush /data/local"
11) type in "adb shell"
12) type in chmod 755 /data/local/zergRush
13) type in "/data/local/zergRush"
14) Good luck, it works on some phones, but not others!
Gänsebraten...
I've been watching this thread develop over the past day or so & just wanted to quickly say I reckon you've done a fantastic job with these instructions mate
I know you'll say you had a lot of help (which you did), but initially, you asked the "right" questions (You knew where you wanted to go, but you didn't quite know how to get there, if you know what I mean ?), you persevered and in the space of one day, you've come up with a really useful reference for anyone who wants to backup their phone purely by using Zegrush.
Well done mate. Fantastic job
Hi, thanks
Indeed i had much Help. I think putting some known Information together can bring a new Usefulness. (Just like how our Phones use some Sensors and some Code and some Internet and form something cool like Google Sky Map)
I'm a bit trained in findind Solutions in General due to my Education and Job, which helps a lot. And im reading and collecting Information and Software on the Topic since 2 days.
Currently im trying to find out how to put the Backup back and if it is enough to be prepared (asked HellcatDroid)
I think this could be the simplest way to backup your phone and be independant from Downloads or Tools (ofc. you need Root somehow)
I added a way to flash back the Images. But i gathered it from the Forum and did not test it myself. Anybody can confirm it? Maybe someone tested it?
gänsebraten said:
I think this could be the simplest way to backup your phone and be independant from Downloads or Tools (ofc. you need Root somehow)
Click to expand...
Click to collapse
I notice you went with a permanent root rather than temp root method, which means your backup will also be rooted and thus not stock. If you go for temp root instead (i.e. not pushing busybox, su, superuser) then the backup would be as close as you're likely to get to stock. In case you missed it, I specifically linked you to temp root (http://forum.xda-developers.com/showthread.php?t=1296916) rather than DoomMLoRD's perma-root script (http://forum.xda-developers.com/showthread.php?t=1321582)
thanks oinky, i did not get, that it was a temp root
What exactly makes it temp? Will it unroot when the Phone restarts?
I really missed that point Well i'll test that tomorrow.
Can you confirm my way of "using" the Backup? Will i have 100% of my old status back (except the rooting thing ofc.)? Can i start happy flashing now?
Sorry i have to ask again. Did someone already test flashing the Backups back?
I also would appreciate a confirmation that the restoration via this method works fine.
can anyone confirm this? probably mr. oinkylicious? you seem to me very sagacious.
added the direct use of zergrush in my Guide. now you'll leave even less traces (Although i found no traces with using Doomlord). The Zergrush-File we adb-pushed is gone, too
But one thing we dont know yet:
Will the backups work and be 100% sufficient when done correctly? I'm asking for someone who can confirm or has tested that
Additional Tips i found:
boomsh error at second zergrush:
http://eitwebguru.com/tag/cannot-copy-boomsh-permission-denied/
To fix this issue you have to delete two files i.e. /data/local/tmp/boomsh and /data/local/tmp/sh. Following are the commands to remove the files
E:\ADB\adb.exe shell
$ rm /data/local/tmp/boomsh
$ rm /data/local/tmp/sh
I did a compare (cmp imagefile and directory) and got several problems e.g. "differ byte 1036"
Also i found a thread where someone got Problems with dd
http://forum.xda-developers.com/showthread.php?t=1149714
might be unsafe
gänsebraten said:
Additional Tips i found:
boomsh error at second zergrush:
http://eitwebguru.com/tag/cannot-copy-boomsh-permission-denied/
To fix this issue you have to delete two files i.e. /data/local/tmp/boomsh and /data/local/tmp/sh. Following are the commands to remove the files
E:\ADB\adb.exe shell
$ rm /data/local/tmp/boomsh
$ rm /data/local/tmp/sh
I did a compare (cmp imagefile and directory) and got several problems e.g. "differ byte 1036"
Also i found a thread where someone got Problems with dd
http://forum.xda-developers.com/showthread.php?t=1149714
might be unsafe
Click to expand...
Click to collapse
oh no, this would be such a nice method
gänsebraten said:
thanks oinky, i did not get, that it was a temp root
What exactly makes it temp? Will it unroot when the Phone restarts?
I really missed that point Well i'll test that tomorrow.
Can you confirm my way of "using" the Backup? Will i have 100% of my old status back (except the rooting thing ofc.)? Can i start happy flashing now?
Click to expand...
Click to collapse
Well as for the guarantee I have bad news for you.
The bad news is that your current backup is useless, if you did a permanent root, not a temporary root, which means that the backup is rooted and therefore not stock.
In that case unroot and make another one.
Besides that I'm curious...
I got my phone from o2 Germany and already had it replaced twice AFTER flashing it.
Does 1&1 have a special branding? What sort of branding do you have? o2 had none and therefore I just flashed a ROM from Intratech's thread before returning it and reset the custom binary counter.
Sent from my GT-I9100 using XDA App
hi sniperfan,
my backup is not useless, just look at my guide where the unroot is implemented. I have now a temp-rooted backup, too.
The Branding is a modified starting-screen, some apps (mail etc.), an own market, starting page in browser.
In Addition i do not find any ROMS/Kernels to download (look at my post 1). There must be a way how the branded ones were created. I would love to see the List to be completed.
gänsebraten said:
There must be a way how the branded ones were created.
Click to expand...
Click to collapse
Thats the point gänsebraten!
how are the branded ROMs being created? there must be a way to produce them!
how it is achieved and how can we do it?
Yay, lot's of good info in this thread already
Yeah, doing "raw dumps" via "dd" of all(!) partitions is the perfect thing to do, I did that myself before I flashed anything (except the kernel, but for my initial ROM the kernel was available for download).
So you should end up with a bunch of dd images, the ones you really need are:
- mmcblk0p1 => EFS
- mmcblk0p4 => param.lfs (contains the bootscreen and some tiny other bits)
- mmcblk0p5 => kernel
- mmcblk0p8 => modem FW
- mmcblk0p9 => system
- mmcblk0p10 => userdata
Do *NOT* overwrite these onw when restoring:
- mmcplk0p2 and p3 => SBL, bootloaders, don't touch them, just leave them allone, this is the ONE way to really, unrecoverably BRICK the device, breaking these buddies.
What you "can" backup/restore, but don't really need to:
- mmcblk0p7 => cache
- mmcblk0p11 => "internal SD card"
- mmcblk0p12 => some preinstall stuff
To restore something / everything, just reverse the dd command, so if you used
Code:
dd if=/dev/block/mmcblk0p9 of=/sdcard/system.img bs=4096
to dump/backup a partition, use
Code:
dd if=/sdcard/system.img of=/dev/block/mmcblk0p9 bs=4096
to restore it.
Another note on that:
Once you dd'ed the kernel, you should really flash a CWM kernel and then do all the other dd's from recovery mode via ADB.
Reason being: dd'ing a mounted filesystem (i.e. while the system is running and accessing it) can (usually WILL) lead to an unclean/corrupted image that doesn't work properly anymore when restored.
gänsebraten said:
hi sniperfan,
my backup is not useless, just look at my guide where the unroot is implemented. I have now a temp-rooted backup, too.
The Branding is a modified starting-screen, some apps (mail etc.), an own market, starting page in browser.
In Addition i do not find any ROMS/Kernels to download (look at my post 1). There must be a way how the branded ones were created. I would love to see the List to be completed.
Click to expand...
Click to collapse
Sorry I got that wrong.
As for your question:
Here is one way. (Note: NOT for that galaxy s2 in this thread, so command may differ)
http://forum.xda-developers.com/showthread.php?t=1082288
I will test it tomorrow...eeehhhhhm....later. xD
They simply compose their own updates with added apps and "tweaked" configurations.
Sent from my GT-I9100 using XDA App
This was purely experimental for me, but it worked. And now I have my serial number back.
Pre-requisites:
1. You need CWM, running internal, or at least two microSD cards to be running from sd card.
2. Two MicroSD card required.
3. If you're using Windows you need some program that can perform disk dumps. I use Ubuntu... so... I don't know if the commands are similar in windows, sorry.
4. You'll need someone else' serial number. In other words, you'll need someone else' backup of the /rom partition. Check lavero.burgos unbrick topic. I think there is one on there.
This should be at least somewhat risk-free. Since it doesn't actually tinker with settings
Okay, so boot into internal cwm on your Nook. Make sure you have an sdcard in your nook. Then run adb:
Code:
$ adb start-server
$ adb devices
Make sure you see your device and it shows it in recovery mode.
Code:
$ adb shell
~ # mount sdcard
~ # dd if=/dev/block/mmcblk0p5 of=/sdcard/blk/mmcblk0p5.img
~ # exit
$ adb pull /sdcard/blk/mmcblk0p5.img /path/to/file/mmcblk0p5.img
$ adb shell
~ # rm /sdcard/blk/mmcblk0p5.img
~ # exit
At this point you insert your sdcard into your computer. Depending on what adapter you use, we need to make sure that you are going to use the correct device... so...
Code:
$ fdisk -l
Other than your Hard Disk's partitions (usually the first four), you should see a second one, either /dev/mmcblk0 or /dev/sdc depending on the adapter, but make sure it is the same size as your SD card, so you know which one you are going to be using. Once you verify which one is yours go ahead and umount it.
Code:
$ dd if=/path/to/file/mmcblk0p5.img of=/dev/mmcblk0
Wait for it to finish, shouldn't take longer than a half-minute, once it's done, Go ahead and mount it again, you should see the only partition as "rom", and two folders: devconf, and log.
Navigate to devconf, and there's a bunch of other files. Open "DeviceID" in vim or notepad or something. This is your Serial No., or where it should be anyway. On your nook, if you pop open the little MicroSD flap, you will see the device' serial number. Delete whats in that file, and type your Serial No. on there. Close and don't forget to save it. Now open "SerialNumber" and delete what's on there, and key in YOUR serial number. Close and save.
Umount your sdcard again. Delete the original mmcblk0p5 (/path/to/file/mmcblk0p5). Then jump into shell
Code:
$ dd if=/dev/mmcblk0 of=/path/to/file/mmcblk0p5
$ adb push /path/to/file/mmcblk0p5 /sdcard/blk
$ adb shell
# ~ dd if=/sdcard/blk/mmcblk0p5 of=/dev/block/mmcblk0p5
# ~ umount /sdcard
# ~ exit
In cwm go into advanced/reboot recovery. Let it reboot. And then when it's in cwm run "adb devices" and verify your serial number is there.
Thanks to Pete1612 and lavero.burgos ! Hopefully Pete1612 will test out this method too. This should be relatively easy, it's not hard. Just time consuming. -_-
Once again, let me know if I made any mistake
I will as soon as I get the I/O error figured out
Sent from a better galaxy
Pete1612 said:
I will as soon as I get the I/O error figured out
Sent from a better galaxy
Click to expand...
Click to collapse
The I/O error means the partition is damaged, however when unmounted the sdcard and re-inserted it, it seemed to work fine, so I went with it.
I took a different SD card and it worked.
Sent from a better galaxy
Probably keep this but it's u service the as card tab I. the back of the Cover
@ae1990
1. Type reply
2. Verify that what you typed was correct
3. Submit
I think you forgot step 2.
Edit-
That came off ruder than intended, I would actually like to know what you were trying to say.
Sent from my SCH-I500 using Tapatalk 2
I think have a way:
1. Copy mmcblk0p5 from nook tablet fine and push to sdcard
2. Use dd command
dd if=/sdcard/blk/mmcblk0p5 of=/dev/block/mmcblk0p5
3. In Cm7 ( boot sdcard) or stock rom have root, i use root exploer change serial in file devices id, serialnumber in rom/devconf.
I had changed my nook by this way. It success, it pass b&n :0
a much easier method... from any rooted nook with ADBD enabled.
Get either adb shell or a terminal and change to root user by issuing the "su" command.
copypasta this block
Code:
mkdir /data/local/mnt
mount /dev/block/mmcblk0p4 /data/local/mnt
Serial=`cat /data/local/mnt/devconf/SerialNumber`
echo "Your Nook Tablet Serial Number is: $Serial"
You will receive a message that says "Your Nook Tablet Serial Number is: ************"
OP is convoluted.
AdamOutler said:
a much easier method... from any rooted nook with ADBD enabled.
Get either adb shell or a terminal and change to root user by issuing the "su" command.
copypasta this block
Code:
mkdir /data/local/mnt
mount /dev/block/mmcblk0p4 /data/local/mnt
Serial=`cat /data/local/mnt/devconf/SerialNumber`
echo "Your Nook Tablet Serial Number is: $Serial"
You will receive a message that says "Your Nook Tablet Serial Number is: ************"
OP is convoluted.
Click to expand...
Click to collapse
OP has made a guide to restore it.
Yours is a way to print it out *if* its there, anyone can read it under the sd card latch so i dont see your reasoning of this post.
Hello, Can you help a noob with this ? I am at a command prompt. Wrong serial # Recovery
now what exactly ? Thanks
Hey I'm not sure if this is right, but can't you just lift up the tab where the sd card goes? It says SN: followed by a bunch of numbers.
When I needed a new charging cable, they asked for the serial number, and I just read it from there.
Sorry if this isn't what you guys are talking about, just thought I'd post.
ACL3 said:
Hey I'm not sure if this is right, but can't you just lift up the tab where the sd card goes? It says SN: followed by a bunch of numbers.
When I needed a new charging cable, they asked for the serial number, and I just read it from there.
Sorry if this isn't what you guys are talking about, just thought I'd post.
Click to expand...
Click to collapse
Thanks
the thread is to recover a sn that is MIA or incorrect for the nook in use. Some have lost their sn (no longer in nt) or replace an incorrect sn with the correct sn.
What if you can't see your NOOK TABLET?
My problem here is I can't get my computer to see the NT. When I update the drivers, it brings it up as an android phone and under that says "Android Composite ADB Interface". Any help. I think I might have completely screwed this up.
I realize this thread is old but I've been trying to go through the process. My first question is how large does the mmcblk0p5 get when you dd it? I was using a 2gb SD and the file took up 2gb then. My second question is if anyone knows how to complete the final push back to the SD card in the nook. It begins to push but after some time the nook screen flashes and it seems to hang. Thanks in advance.
Just use es explorer with root privileges heh.
So would I just copy the file to the sdcard, then once that's done transfer the card back to the nook, and use the es explorer? I'm not quite sure how to do exactly what you stated.
Boot rom , open es give root rights go to / rom find file edit it onthefly, save reboot done
Demetris said:
Boot rom , open es give root rights go to / rom find file edit it onthefly, save reboot done
Click to expand...
Click to collapse
Really, it's that simple? Wow, and I was working through all this last night!
Recently my Nook Tablet 16Gb stopped opening ebooks. It is quite essential feature since I only use it to read books.
The story started ~2-3 years ago. I have bought Nook Tablet and wanted to get root access (to get some nice apps from android market). To get root access I used something like zergRush tutorial os similar. It worked fine until the B&N released new update 1.4.3. I have lost root access. Yet I was able to run already installed apps. It was totally fine with me: ebooks + a few apps from android market.
Yet as I said in the beginning, I could not open ebooks anymore. So I decided to erase & deregister device (and say goodbye to limited root). I clicked it and after Nook restarted the message "Please restart your device and try again...." showed up. After the second restart the message disappeared but Nook was not erased. The same data, the same issue.
Then I decided to google and try to "unbrick" (despite it is not really bricked). I made bootable microSD, and tried loading 1.4.2 factory recovery zip. Everything was fine, I even saw a green checkmark on a screen "Do NOT Turn Off Your Device Installing New Software....". Yet after I ejected microSD and Nook restarted, nothing changed. It was still the same system with exactly the same data.
Next thing that I have tried is to follow steps from github of succulent under acclaim_recovery_sdcard. The same story. After restart Nook always keeps running the same system.
I even formatted the following partitions in one time:
/rom
/bootdata
/system
/cache
/data
The same system after restart...
Tried to apply root for 1.4.3 and install different rom. The same system as before any manipulations.
How is it even possible?! What should I try next? Any ideas appreciated.
Here is additional information. I logged in using adb shell and executed the following commands:
Code:
adb shell
# whoami
root
# cd /tmp
# mkdir mnt
# mount /dev/block/mmcblk0p8 mnt
# du -sh mnt
402.7M mnt
# rm -rf mnt/*
# du -sh mnt
4.0K mnt
# umount mnt
# mount /dev/block/mmcblk0p8 mnt
# du -sh mnt
402.7M mnt
It seems that I cannot modify anything on my NT.
I have also tried to fill some partitions with zeros to see what happens
Code:
# dd if=/dev/zero of=/dev/block/mmcblk0p8
# mount /dev/block/mmcblk0p8 mnt
# du -sh mnt
402.7M mnt
No effect. Could not wipe any data from NT. Any ideas what it can be and how it can be fixed?..
I hate to say it, but I've seen the same thing, and finally gave up after days of trying.
(see page 2 currently in this forum " cant modify any partitions. want to totally ZAP the NT" )
in hundreds of NOOKS reworked, I had this one, like yours, that no matter what I did, nothing about the partitions would change,
I did things to it that should have rendered it totally dead, yet it reboots every time with the exact same OS and installed stuff as before
I tried every utilty, and manually using partition tools many times.
I believe the flash RAM gets set with a "read-only" attribute and its deep, something very special must be done to un-do it.
theres a utility called Roehsoft Drive Expert, which when I mailed the developer he claimed he could correct it, but for me it wasnt worth paying for the app ($34).
I finally just took it for parts and put a working system board in it
I was wonder how to add file system check every boot since my data partition often unclean. I had try to add line in init.rc before mount and static e2fsck binary to /sbin.
Like this one: "e2fsck -fy /dev/block/data" but I think it has no effect since my tablet failed to boot. I must go to recovery and do fsck via adb shell. It is annoying. I want to make it automatically. Please help me.
Thank you..
juliantito said:
I was wonder how to add file system check every boot since my data partition often unclean. I had try to add line in init.rc before mount and static e2fsck binary to /sbin.
Like this one: "e2fsck -fy /dev/block/data" but I think it has no effect since my tablet failed to boot. I must go to recovery and do fsck via adb shell. It is annoying. I want to make it automatically..
Click to expand...
Click to collapse
Assuming you know that you need to repack your boot image to change init.rc and you did that, try prefixing your command in init.rc with "exec".
I want to run E2FSCK on every boot and repair the disk if there is some problem on Odroid N2 Android. I have used the tune2fs -c 1 command to check the disks on every boot.I want to confirm whether this command will repair the problem (if detected) as well.
I think that in Android Source code they have made sure that the disk will be checked however, I don't know whether they fix the disk as well. Please confirm this as well.
In Odroid N2 Android image, the directory /etc/default/rcS is missing, so I can't make changes to it. I can't run a script on each boot because the disks are mounted by then and I can't umount them because the disk is being used.
If anyone has some solution, I will really appreciate your help.
Okay so here it goes. I had missing IMEI problem in a custom ROM when not on a samsung base. I had a neatefs (app on android) backup which I tried to restore using HC ktool (Bad idea, I know). It gives me a successfully done message and tells me to reboot. Now my phone is stuck in bootloop no matter what (Stock firmware, wipe data, factory reset nothing works) and the recovery gives the error mentioned in the title.
/efs is unmountable for me. I tried various methods mentioned for S3 and Note such as connecting the phone in ADB mode and following the steps but none of that works.
Have you tried formatting /system, /boot, /preload /storage/sdcard0 ? From a rooted kernel, of course.
And then trying reflashing the original stock rom.
hope this helps http://forum.xda-developers.com/galaxy-s3/general/how-to-fix-efailed-to-mount-efs-invalid-t2858056
AKAndrew41 said:
Have you tried formatting /system, /boot, /preload /storage/sdcard0 ? From a rooted kernel, of course.
And then trying reflashing the original stock rom.
Click to expand...
Click to collapse
I have tried formatting /system and I don't think that formatting /sdcard0 is going to help, it will just increase the burdon of data transfer. As for others, I was afraid it will make more mess than solve any. Are you sure formatting those will not affect anything?
ruleh said:
hope this helps http://forum.xda-developers.com/galaxy-s3/general/how-to-fix-efailed-to-mount-efs-invalid-t2858056
Click to expand...
Click to collapse
I've tried all that, none helps. I've even installed a busybox as mentioned somewhere else which said that the syntax mke2fs is not available without a busybox. Nothing worked. Still unable to mount efs afterwards.
pHraiL^ said:
I have tried formatting /system and I don't think that formatting /sdcard0 is going to help, it will just increase the burdon of data transfer. As for others, I was afraid it will make more mess than solve any. Are you sure formatting those will not affect anything?
Click to expand...
Click to collapse
I'm pretty sure it won't damage anything, or at least to me didn't. Because whenever I want to reinstall a new ROM I always format everything I've mentioned earlier so I don't find it harmful for the device, as long as you don't have data worth backing up.
Also, wipe dalvik.
If you installed busybox, make sure you uninstall the previous version prin pressing uninstall, and them installing 1.23.1 because for me sometimes it says it's intalled, but after reboot I still have the old one.
After you do that, connect phone to PC and try running
adb shell
Once you do that, give a try to the command
umount -f /efs
even if it says it's umounted, then type
mount /dev/block/mmcblk0p3 /efs
mke2fs /dev/block/mmcblk0p3
mount -w -t ext4 /dev/block/mmcblk0p3
Click to expand...
Click to collapse
These two are the commands everyone is talking about the S3 phone having same issue. I tried everything. The first command works and it shows something like:
"The filesystem will be automatically checked every 35 mounts or 180 days, whichever comes first. Use tune2fs -c or -i to override."
For the second line of code when I try, this is what I get:
"It says "mount: can´t find /dev/block/mmcblk0p3 in /etc/fstab"
Now I have also tried adding space and /efs to the second command. It gives me nothing, not even any error. So I presume it works but then when I reboot efs is still messed up. I have no idea what these commands does actually. I think it has something related to re partitioning. Shouldn't the second command line give the same output as the first one? Its been a whole day searching for this thing. I got my phone messed up real bad.
EDIT: One more thing, when I hit the # df command on ADB, it shows 3 drives (/dev, /cache, /emmc) when not in su and 4 when in su (/dev, /cache, /emmc, /system). No where it shows any efs partition. Is there suppose to be any?
EDIT2: After the second line command. Using mount -t following someone's guide I get the efs partition but I think it is way too small. See the attachment. This partition is gone again after reboot.
OH GOD I got it working. After more searching, I found out the the block used for efs storage in S2 is mmcblk0p1 not mmcblk0p3. Phew!
Follow the same commands to make it work. Just rename the block.
Here is a guide which helped me figure out the block: http://www.usoftsmartphone.com/t306464.html
Thanks everyone
im having same trouble now with the S7. the page you share not there anymore. please share me how to figure out the block